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1Ds
for
young,
strait-laced
group
of
stars
(9)
1Ds for young, strait-laced group of stars (9)
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The definition is at the beginning of the clue.
How the clue works
The definition is 1Ds for young, where 1D is cross-referenced (schools), giving primary schools for young children. The wordplay is a charade: PRIM (strait-laced) plus ARIES (a group of stars, the constellation) makes PRIMARIES.